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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '833413931b35926dc5782ad61868658a5097fe11b7da516899604497b08ec1d7' 
  AND token = '0NOd31wPvSVpUVs+8Xbt5ntzqrv6qb79vbK7ySbiGNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}